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DETERMINATION OF THE SOUND TRANSMISSION RATE OF DIESEL ENGINES BY MEANS OF CYCLIC FLUCTUATIONS

The pressure time history in the combustion chamber of an IC-engine is seen as a sound phenomenon which--attenuated by the engine structure--is radiated as combustion noise. A distinction has been made between the direct and indirect combustion noise. The subject "transmission rate/direct combustion noise" has been investigated by the example of an air-cooled single cylinder diesel engine. To this end short-range noise intensity measurements as well as cylinder pressure measurements at several points in the combustion chamber have been carried out simultaneously. The evaluation method chosen considers the considerable cyclic fluctuation from working cycle to working cycle of the cylinder pressure level to check the applicability of a transmission rate. Within a frequency range of 0.5 to 9.5 kHz the correlation coefficients of sound intensities and cylinder pressure excitation have been determined in 500 Hz band-width for 50 successive working cycles. The results of the investigation can be used for evaluation of the acoustic properties of the combustion process.

  • Supplemental Notes:
    • A Worldwide View of Diesel Combustion Emissions and Analysis, P-130. International Off-Highway Meeting and Exposition Milwaukee, Wisconsin, September 12-15, 1983.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Schmillen, K
    • FLOTHO, A
    • Schluender, W
  • Publication Date: 1983-9

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Filing Info

  • Accession Number: 00382411
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Files: HSL, USDOT
  • Created Date: Mar 30 1984 12:00AM